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Silver Bromide (AgBr)

♦ Silver Bromide (AgBr) Data Sheet    ♦ Silver Bromide (AgBr) MSDS

Silver Bromide is useful material for very deep IR applications where sensitivity to moisture is a problem. Silver Bromide crystal growth was developed relatively recently by the standards of many IR materials. The parameters of Silver Bromide have not been researched as thoroughly as those of Silver Chloride. This soft crystal deforms under heat and pressure and can be forged in polished dies to create IR windows and lenses.

Transmission Range :0.45 to 35 μm (1)
Refractive Index :2.167 at 10 μm (1)(2)
Reflection Loss :23.9% at 10 μm (2 surfaces)
Absorption Coefficient :Not known
Reststrahlen Peak :112.7 μm
dn/dT :Not known
dn/dμ = 0 :Not known
Density :6.473 g/cc
Melting Point :432 °C
Thermal Conductivity :1.21 W m-1 K-1 at 273 K
Thermal Expansion :30 x 10-6/°C at 273 K
Hardness :Knoop 7
Specific Heat Capacity :292 J Kg-1 K-1
Dielectric Constant :13.1 at 1MHz (2)
Youngs Modulus (E) :31.97 GPa
Shear Modulus (G) ;Not Known
Bulk Modulus (K) :44.03 GPa
Elastic Coefficients :C11=56.3 C12=32.3 C44=7.25
Apparent Elastic Limit :26.2 MPa
Poisson Ratio :Not Known
Solubility :12 x 10-6g/100g water at 20°C
Molecular Weight :187.78
Class/Structure :Cubic FCC, NaCl, Fm3m, No cleavage, cold flows

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.
µm   Noµm   Noµm   No
0.391   2.4160.477   2.330.496   2.313
0.55   2.270.6   2.250.65   2.24
0.781   2.2059.926   2.16712.66   2.162

Silver Bromide is grown in small ingots by sealed ampoule Stockbarger techniques. Silver Bromide is malleable and deep yellow, it darkens in sunlight, but less readiliy than Silver Chloride.

(1) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0
(2) White; Optical Properties of Silver Bromide. J.Opt.Soc. Am. V62, N2 (1973)